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Intramuros is built in Spanish colonial architecture, adapted specifically for the Philippines' frequent earthquakes and tropical climate -- thick walls, low profiles, and reinforced buttressing on major buildings, an approach sometimes called "earthquake baroque" when applied to the era's churches. San Agustin Church, the district's oldest surviving structure, is the clearest surviving example, built substantially of adobe and coral stone rather than the brick and timber more common in Spain itself.
The district's defensive walls, built up over decades following its 1571 founding, originally included bastions and a moat as part of a genuine fortification system -- Intramuros was a working fort as much as a residential quarter, a purpose still legible in what survives of the walls today.
Every corner inside the Intramuros walled city carries its own history, and seeing the district properly -- its buildings, churches, and museums -- is easily a full day's outing.
One of the most visited sites in Intramuros, Fort Santiago held political prisoners during the Spanish colonial era, including national hero José Rizal. Today it's a park that can be toured on foot or by kalesa (horse-drawn carriage), planted with flowering trees and home to a resident population of pigeons.
The Manila Cathedral remains the ecclesiastical seat of the Archdiocese of Manila today, just as it was during the Spanish colonial period.
After visiting Intramuros's famous churches, the Casa Manila is a restored mansion-turned-museum, its period furnishings giving a direct sense of how the colonial-era upper class actually lived.
Restored colonial-era homes -- "casas" -- throughout Intramuros showcase the same Spanish architectural style at smaller scale, while sites like the Rizal Shrine and Mabini Shrine focus on individual figures central to Philippine history.
Intramuros occupies a compact 0.67 square kilometer (0.26 square mile) area on the southern bank of the Pasig River, near where the river meets Manila Bay -- a strategic position that let Spanish authorities control river and bay traffic into the wider colony.
The district's defining feature is its own perimeter -- the walls that give Intramuros its name enclose the entire old city in a roughly rectangular footprint, distinct from the dense, modern sprawl of greater Manila that now surrounds it on every side.